SAVOBJ checkpoint failure

We have a process that backs up our dev source and pushes it over to our
prod machine for offsite backup. This has been running for about 6 months
with no problem. We are doing a SAVOBJ to a *SAVF with SAVACT(*LIB) and now
it is failing on one library with the message



Save ended. Unable to reach checkpoint.



I just did the command manually and got the same error. I immediately did a
WRKOBJLCK on the library and there are no locks on it. This process works
on other libraries so it is just one specific library that is "broken".
Since the library only contains source, there shouldn't be anything using
it.



I recommended opening a ticket with IBM but the admins want to have a
meeting first to discuss this and that is not going to happen until tomorrow
which means we lose another night's backup.



Does anyone have any idea what I can look at in advance?